Many-surfaced blackboard



M nu d o M 0 mw Patented Sept. l

Snom/tto@ 7W? 1%/ @fa/wa, j? @MT www Y WMM/Leone@ UNI-TED STATES PATENT' OFFICEA IVILLIAM HENRY LAREV, OF MARIPOSA, CALIFORNIA.

MANY-SURFACED BLACKBARD.

SPECIFICATION forming part of Letters Patent No. 458,852, dated September 1, 1891.

Application tiled August 16, 1890,

To all whom t may concern,.-

Beit known that I, WLLIAM HENRY LA- REW, a citizen of the United States, and a resident of Mariposa, in the county of Mariposa and State ot' California, have invented certain new and useful Improvements in Many-Surfaced Blackboards; and I do declare the following to be afull, clear, and eX- act description of the invention, s'uch as will enable others skilled in the art to'which it appertains to make and use the same, reference being had to the accompanying drawings, and to letters of reference marked thereon, which form a part of this specification.

Figure l of the drawings is a perspective View. Fig. 2 is ahorizontal section, and Fig. 3 is a sectional detail.

My invention relates to ablackboard apparatus for use in schools, courts, Sundayschools, lecture-rooms, kindergartens, and in families or other places where the use of such apparatus is desirable, said apparatus being equally adapted for exhibiting a map or chart.

The objects of my invention are,principally, to give an increased amount of and cheaper blackboard-surface, to provide additional or supplemental blackboard-surface, and the veiling or exposing of an exhibit or the written matter on either or both sides of the flexible sheets and on the blackboard proper or stiff sheet, as desired.

Myinvention consists inthe novel construction and combination of parts, as hereinafter set forth.

In the drawings, A A refer to two blackboards of like construction and supported in an upright frame B in like manner as disclosed in my concurrent application, filed August 1G, 1890, Serial No. 362,212, said frame having also, as in the latter, a chalk or dust box d. The frame B, however, in the present instance is itself sustained or supported pivotally between standards C C, each preferably of an A shape and having its legs or branches connected together by braces dlcomprising plates or bars, one secured to each side of said legs or branches, and having a bottom forming little troughs for holding chalk and erasers. The standards C C are connected together at the front and at the rear near the lower ends by cross-bars b, one fastened to Serial No. 362,213. (No model.)

the front legs or branches and the other to the rear legs or branches of the standards.

I) D are curved slotted bars or guides secured at their ends to the legs or branches of the standards C, and engaging the slots of these guides or bars are screw-bolts c, projecting from the side edges of the frame B. Upon these screw-bolts or projections c are fitted thumb or wing nuts c', by the manipulation of which said frame, with the blackboards, may be adjusted and held at any desired angle of inclination to suit the writer or reader.

B B are sheets of iiexible material about the size of and attached to one of the st-ii .blackboards A A by means of a rod-clasp E,

pressing upon said sheets, its ends entering into the grooves that guide and hold the stift' blackboard. These flexible sheets may be slated paper, slated-cloth, or other suitable material adapted to serve as additional or supplemental blackboards, thus providing increased writing-surface. The flexible sheets B rest upon one of the stiff blackboards A A and are held to the same at the top edge, as above stated. This stiff blackboard may be a plate of wood, a veneer, compressed wood, sheet metal, or other suitable material, and provides a smooth bearing-'surface for the flexible sheets while being written upon, and

as each sheet is thus filled up with written mat.-

ter it is turned back over the top edge of the. stiff blackboard, thus permitting the other surface of the same sheet to be alsowritten upon from the opposite side of the apparatus. If this latter, however, is not desired, the sheets at the conclusion of the writing or filling up of one side of each sheet can all be turned back to the front side of the apparatus and there remain until required for exhibition or reading. From this arrangement it will be further seen that the liexible sheets also serve to veil the written matter on the one or the other and on the stift' blackboard from observation until it `is desired to display or eX- hibit it.

Having described this invention, what I claim, and desire to secure by Letters Patent, 1s

The blackboard device comprising the sashlike frame centrally pivoted to swing in its IOO supporting-frame and means for effecting its edge of said board in position to be Written 1o adgustment therein, upper and lower blaokupon from the opposite side of the devloe, boards sliding in grooves in said frame, a sesubstantially as specified.

ries of flexible sheets having blackboard-sm*- In testimony Whereoi` I afx my signature in faces held to one of said boards by a rod-clasp presence of lWo Witnesses.

pressing upon said sheets and having its ends WILLIAM HENRY LAREVV. held in the grooves in which said board slides, XVitnesses:

the position of said sheets being such as to J. W. REMINGTON,

al1-ow them to be Lurned back over the top J. C. NEEDHAM. 

